| 摘要 |
PROBLEM TO BE SOLVED: To enable sensing of two types of ink amounts having different objects of sensing the ink amount in an ink reservoir for automatically supplying the ink amount to maintain the ink amount in a predetermined range in the reservoir, and sensing an abnormal increase in the ink amount in the reservoir by one ink amount sensing sensor. SOLUTION: The ink amount sensing sensor 27 for sensing the amount of the ink by sensing an electrostatic capacity of the ink stored in the ink reservoir 15 comprises a needle 27a inserted into the ink in the reservoir 15 to sense an increasing or decreasing state of the ink in a predetermined range, and an abnormal increase sensing unit 27b to be contacted with the ink when the ink in the reservoir 15 is abnormally increased. |
